What screen resolution(s) does this game support, and how does it support them?

The "how" question is important. I have a 1920x1200 screen. Compared to say a 1024x768 screen I expect to see more hexes visible on the screen at one time, a lot more hexes, rather than simply having everything including the GUI elements stretched but the same number of hexes shown. So how does GG's WitE handle it?

What screen resolution(s) does this game support, and how does it support them?

The "how" question is important. I have a 1920x1200 screen. Compared to say a 1024x768 screen I expect to see more hexes visible on the screen at one time, a lot more hexes, rather than simply having everything including the GUI elements stretched but the same number of hexes shown. So how does GG's WitE handle it?

Just expand the window. So far as I can tell it'll display as many hexes as will fit on screen.